68 Art. 8.-Y. Takiiliaslü : 



In conclusion the writer wishes to tender his coordial thanks 

 to Prof. Nagaoka, at whose suggestion the present experiment was 

 undertaken. 



Summary. 



1. The hght emitted Ijy the spark between non-magnetic 

 nickel-steel terminals has been examined in different magnetic 

 fields. 



2. ]Man3^ lines photographed at a juxtaposition with a prism 

 spectrograph placed Ijehind an echelon spectroscope have enabled 

 us to compare their relative separations exactly. 



3. The separations of the lines pliotographed were compared 

 with that of the line 44(.)4'75, and, assuming the latter to be 

 proportional to the magnetic field, the behavior of the otliers was 

 studied. The assumption is verified by the fact tliat the 

 separations of many sharp lines are proportional to the separation 

 of the standard line. 



4. The magnetic fields are calculated assuming the specific 

 separation of the standard line 4404*75 given by Mr. Yamada. 



5. Nine strong lines in the violet region being studied 

 carefully, the separations of seven of them were found to he 

 exactly proportional to the magnetic field, wliile the others gave 

 larger specific separations for stronger fields, the components 

 appearing more and more difîïise witli the increase of the field, 

 and the line 441. ")• 13 was rosolverl into seven components in strong 

 fields. 



G. Other less strong fines were also studied. Some of them 

 give different types of separations, which are not proportional to 

 the magnetic field, and the others show that their separations are 

 proportional to the field. Specific separations are given for those 

 measured with less accuracy or with only one or tAVO fields. 



7. Nickel lines photographed on tlie same plate as the iron 

 lines are also given. 



8. jMany sharp lines give separations proportional to the 

 inagnetic field as if there was no mutual influence between the 



